The McCormick 6603944A2 LID is an original equipment manufacturer (OEM) part designed for various McCormick X4 and X5 series tractors, including models X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X4.70M, X4.70V, X4.75, X4.80, X4.80M, X4.90, X4.90M, X5.35, X5.45, X5.55, X5.65, 5-085, 5-095, 5-105, 5-115, 5-120, X5.100, X5.110, X5.120. This LID ensures proper sealing and maintains the integrity of the component it covers. It is also cross-referenced as an OEM part for Landini tractors.